Avoid duplicating maintenance state change

This makes no functional difference, but is technically more correct.

daemon-common/cluster.py

@@ -29,7 +29,13 @@ import daemon_lib.ceph as pvc_ceph
 
 
 def set_maintenance(zkhandler, maint_state):
-    try:
+    current_maint_state = zkhandler.read('/config/maintenance')
+    if maint_state == current_maint_state:
+        if maint_state == 'true':
+            return True, 'Cluster is already in maintenance mode'
+        else:
+            return True, 'Cluster is already in normal mode'
+
     if maint_state == 'true':
         zkhandler.write([
             ('/config/maintenance', 'true')
@@ -40,16 +46,11 @@ def set_maintenance(zkhandler, maint_state):
             ('/config/maintenance', 'false')
         ])
         return True, 'Successfully set cluster in normal mode'
-    except Exception:
-        return False, 'Failed to set cluster maintenance state'
 
 
 def getClusterInformation(zkhandler):
     # Get cluster maintenance state
-    try:
     maint_state = zkhandler.read('/config/maintenance')
-    except Exception:
-        maint_state = 'false'
 
     # List of messages to display to the clients
     cluster_health_msg = []